21232200217 has 2 divisors, whose sum is σ = 21232200218. Its totient is φ = 21232200216.

The previous prime is 21232200169. The next prime is 21232200229. The reversal of 21232200217 is 71200223212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17944209936 + 3287990281 = 133956^2 + 57341^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232200217 - 2⁷ = 21232200089 is a prime.

It is a super-4 number, since 4×21232200217⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21232200247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616100108 + 10616100109.

It is an arithmetic number, because the mean of its divisors is an integer number (10616100109).

Almost surely, 2^21232200217 is an apocalyptic number.

It is an amenable number.

21232200217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232200217 is an equidigital number, since it uses as much as digits as its factorization.

21232200217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 21232200217 its reverse (71200223212), we get a palindrome (92432423429).

The spelling of 21232200217 in words is "twenty-one billion, two hundred thirty-two million, two hundred thousand, two hundred seventeen".